Acquisition of a Network Analyzer for Characterization of Ceramic Materials for Wireless Communication Systems

购买用于表征无线通信系统陶瓷材料的网络分析仪

• 批准号: 9504015
• 负责人: Pradeep Fulay
• 金额: $ 6万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9504015&HistoricalAwards=false
• 关键词: Acquisition; Network; Analyzer; Characterization; Ceramic

9504015 Phule Personal communication services (PCS) represent a burgeoning and revolutionary family of microwave based technologies (400 MHz to 30 GHz). Familiar examples include cellular telephones, wireless cable, direct broadcast, and interactive television. To store, transfer, and filter electromagnetic waves, components based on ceramic materials are indispensable. New and better ceramics for wireless communications (CWC), characterized by exceptionally high quality factors, a relatively high dielectric constant, and adequate temperature stability will be highly desirable for further miniaturization and enhanced performance of certain microwave components. The major goal of this program is to conduct a systematic investigation of the synthesis and processing of potentially novel ceramic materials for microwave applications. Our research is being conducted so as to gain deeper insights into the fundamental relationships between the atomic level defects, heterogeneous interfaces, and the microwave dielectric properties of ceramic materials. %%% For achieving the central goal of our research, it is critical to measure the dielectric properties of materials, in the microwave frequency range (400 MHz to 40 GHz). Using a microwave network analyzer is the only direct way to characterize such microwave properties. This award provides funds to acquire such a network analyzer. Presently, this unit is not available at the University of Pittsburgh. This instrument will enhance the quality of the research program. Using the network analyzer, we will be able to experimentally determine the microwave properties in relation to the composition and microstructure of sintered, polycrystalline ceramics in the tantalum oxide-zirconia, niobium oxidezirconia, and other systems. We plan to investigate the influence of composition, and micorstructural features (such as grain size, porosity, and grain boundary microchemistry) of samples processed using different sintering time-temperature profiles. We also seek to understand the influence of controlled levels of different dopants and impurities on the microwave dielectric constant and quality factor of different compositions. These properties will be measured at different temperatures (100- 500 K) so as to elucidate the fundamental mechanisms that influence microwave properties. ***

9504015 Phule个人通信服务(PC)代表了一个新兴的、革命性的基于微波的技术家族(400兆赫兹至30千兆赫)。常见的例子包括蜂窝电话、无线电缆、直播和交互式电视。要存储、传输和过滤电磁波，以陶瓷材料为基础的元件是必不可少的。新型和更好的无线通信陶瓷(CWC)具有极高的品质因数、相对较高的介电常数和足够的温度稳定性，将非常适合于某些微波元件的进一步小型化和增强性能。该项目的主要目标是对微波应用中潜在的新型陶瓷材料的合成和加工进行系统的研究。我们的研究是为了更深入地了解原子级缺陷、异质界面和陶瓷材料的微波介电性能之间的基本关系。%为了实现我们研究的中心目标，在微波频率范围(400 MHz到40 GHz)测量材料的介电性能是至关重要的。使用微波网络分析仪是表征这种微波特性的唯一直接方法。该合同为购买这样一台网络分析仪提供了资金。目前，匹兹堡大学还没有提供这一单元。该仪器将提高研究项目的质量。使用网络分析仪，我们将能够在实验上确定与氧化钽-氧化锆、氧化Nb-氧化锆和其他系统中烧结的多晶陶瓷的组成和微观结构有关的微波性能。我们计划研究用不同的烧结时间-温度曲线处理的样品的成分和微观结构特征(如晶粒度、气孔率和晶界微观化学)的影响。我们还试图了解不同掺杂和杂质的受控水平对不同成分的微波介电常数和品质因数的影响。这些特性将在不同的温度下(100-500K)进行测量，以阐明影响微波特性的基本机制。***